FN Archimer Export Format
PT J
TI The open sea as the main source of methylmercury in the water column of the Gulf of Lions (Northwestern Mediterranean margin)
BT 
AF COSSA, Daniel
   DE MADRON, Xavier Durrieu
   SCHAFER, Jorg
   LANCELEUR, Laurent
   GUEDRON, Stephane
   BUSCAIL, Roselyne
   THOMAS, Bastien
   CASTELLE, Sabine
   NAUDIN, Jean-Jacques
AS 1:1,2;2:3;3:4;4:4;5:2;6:3;7:5;8:1;9:6;
FF 1:PDG-RBE-BE-LBCM;2:;3:;4:;5:;6:;7:PDG-RBE-BE-LBCM;8:;9:;
C1 IFREMER, Mediterranean Ctr, BP 330, F-83507 La Seyne Sur Mer, France.
   Univ Grenoble Alpes, ISTerre, BP 53, F-38041 Grenoble, France.
   Univ Perpignan, Cnrs Cefrem, 52 Ave P Alduy, F-66860 Perpignan, France.
   Univ Bordeaux, Epoc, F-33615 Pessac, France.
   IFREMER, Atlantic Ctr, BP 21105, F-44311 Nantes 03, France.
   Univ P & M Curie, Lobb, F-66651 Banyuls Sur Mer, France.
C2 IFREMER, FRANCE
   UNIV GRENOBLE ALPES, FRANCE
   UNIV PERPIGNAN, FRANCE
   UNIV BORDEAUX, FRANCE
   IFREMER, FRANCE
   UNIV PARIS 06, FRANCE
SI TOULON
   NANTES
SE PDG-RBE-BE-LBCM
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
IF 4.69
TC 30
UR https://archimer.ifremer.fr/doc/00363/47399/47477.pdf
LA English
DT Article
CR BIOPRHOFI
   CASCADE
BO Le Suroît
   L'Atalante
DE ;Mercury;Methylmercury;Ocean margin;Coastal area;Mediterranean
AB Despite the ecologic and economical importance of coastal areas, the neurotoxic bioaccumulable monomethylmercury (MMHg) fluxes within the ocean margins and exchanges with the open sea remain unassessed. The aim of this paper is to address the questions of the abundance, distribution, production and exchanges of methylated mercury species (MeHgT), including MMHg and dimethylmercury (DMHg), in the waters, atmosphere and sediments of the Northwestern Mediterranean margin including the Rhône River delta, the continental shelf and its slope (Gulf of Lions) and the adjacent open sea (North Gyre).  Concentrations of MeHgT ranged from <0.02 to 0.48 pmol L−1 with highest values associated with the oxygen-deficient zone of the open sea. The methylated mercury to total mercury proportion (MeHgT/HgT) increased from 2% to 4% in the Rhône River to up to 30% (averaging 18%) in the North Gyre waters, whereas, within the shelf waters, MeHgT/HgT proportions were the lowest (1–3%). We calculate that the open sea is the major source of MeHgT for the shelf waters, with an annual flux estimated at 0.68 ± 0.12 kmol a−1 (i.e., equivalent to 12% of the HgT flux). This MeHgT influx is more than 80 times the direct atmospheric deposition or the in situ net production, more than 40 times the estimated “maximum potential” annual efflux from shelf sediment, and more than 7 times that of the continental sources. In the open sea, ratios of MMHg/DMHg in waters were always <1 and minimum in the oxygen deficient zones of the water column, where MeHg concentrations are maximum. This observation supports the idea that MMHg could be a degradation product of DMHg produced from inorganic divalent Hg.
PY 2017
PD FEB
SO Geochimica Et Cosmochimica Acta
SN 0016-7037
PU Pergamon-elsevier Science Ltd
VL 199
UT 000393125500015
BP 222
EP 237
DI 10.1016/j.gca.2016.11.037
ID 47399
ER

EF